Cam lobe

A cam lobe piece of a built-up type camshaft for an internal combustion engine. The built-up type camshaft includes a hollow shaft fixedly inserted in a shaft opening of the cam lobe piece upon diametrical expansion of the hollow shaft. The cam lobe piece comprises a base circle section having the shaft opening, and a cam lobe section formed integral with the base circle section. In this cam lobe piece, the cam lobe piece is formed of a ferrous sintered material which has a density (.rho.) meeting the following equation:. rho.(g/cm.sup.3).gtoreq.-3/8.times.t+8.9where t is a thickness (mm) of the base circle section in radial direction.

cam lobe

A method of producing a cam lobe piece of an assembled camshaft in a valve operating system for an internal combustion engine. The method comprises forming a profile of the cam lobe piece by upsetting a material under forging to obtain an intermediately formed body; piercing a central portion of the intermediately formed body to form a shaft bore; and ironing an inner peripheral surface of the pierced intermediately formed body to form unevenness at the inner peripheral surface, all accomplished by cold working. The material at the forming the profile of the cam lobe piece has a first section located on a side of a cam nose of the cam lobe piece, and a second section located longitudinally opposite to the first section. The material has a thickness which gradually increases in a direction from the second section to the first section.

Camshaft - Cam overhead - Single overhead cam - Double Overhead Cam - Cam piston - Cam lobe - Cam valve

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